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<table width="100%" summary="page for CHAIN"><tr><td>CHAIN</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>
Subset of variables from the CHAIN project
</h2>

<h3>Description</h3>

<p>The CHAIN project was a longitudinal cohort study of people living with HIV in New York City, 
which was recruited in 1994 from a large number of medical care and social service agencies
serving HIV in New York City. This subset of data pertain to the sixth round of interviews.
</p>


<h3>Usage</h3>

<pre>data(CHAIN)</pre>


<h3>Format</h3>

<p>A <code>data.frame</code> with 532 observations on the following 8 variables.
</p>

<dl>
<dt><code>log_virus</code></dt><dd>
<p>log of self reported viral load level, where zero represents an undetectable level.
</p>
</dd>
<dt><code>age</code></dt><dd>
<p>age at time of the interview
</p>
</dd>
<dt><code>income</code></dt><dd>
<p>annual family income in 10 intervals
</p>
</dd>
<dt><code>healthy</code></dt><dd>
<p>a continuous scale of physical health with a theoretical range between 0 and 100 where
better health is associated with higher scale values
</p>
</dd>
<dt><code>mental</code></dt><dd>
<p>a binary measure of poor mental health ( 1=Yes, 0=No )
</p>
</dd>
<dt><code>damage</code></dt><dd>
<p>ordered interval for the CD4 count, which is an
indicator of how much damage HIV has caused to the immune system
</p>
</dd>
<dt><code>treatment</code></dt><dd>
<p>a three-level ordered variable:
0=Not currently taking HAART (Highly Active AntiretRoviral Therapy)
1=taking HAART but nonadherent,
2=taking HAART and adherent
</p>
</dd>
</dl>



<h3>Details</h3>

<p>A missing value in the log virus load level 
was assigned to individuals who either could not recall
their viral load level, did not have a viral load test in the six month
preceding the interview, or reported their viral loads as &quot;good&quot; or &quot;bad&quot;.
</p>


<h3>Source</h3>

<p>http://cchps.columbia.edu/research.cfm
</p>


<h3>References</h3>

<p>Messeri P, Lee G, Abramson DA, Aidala A, Chiasson MA, Jones JD. (2003).
&ldquo;Antiretroviral therapy and declining AIDS mortality in New York City&rdquo;.
<em>Medical Care</em> 41:512&ndash;521.
</p>


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